Narrowed trigger criteria

Instead of running every time document.head mutates, only run when mutation is an attribute change, target is a link, rel includes icon, and attribute is href.

src/SEQTA.ts

@@ -52,17 +52,29 @@ async function init() {
 
     replaceIcons();
 
-    const observer = new MutationObserver(() => {
+    const observer = new MutationObserver((mutations) => {
+      for (const mutation of mutations) {
+
+        if (
+          mutation.type === "attributes" &&
+          mutation.target instanceof HTMLLinkElement &&
+          mutation.target.rel.includes("icon") &&
+          mutation.attributeName === "href"
+        ) {
           replaceIcons();
+          return;
+        }
+      }
     });
 
     observer.observe(document.head, {
-      childList: true,
       subtree: true,
       attributes: true,
-      attributeFilter: ["href", "rel"],
+      attributeFilter: ["href"],
     });
 
+
+
     try {
       await initializeSettingsState();